© Copyright Malcolm Storey 2011-2118 · 3 Trichoniscus pusillus Click on map for details about points. IDnature guide Oniscidea 80x5 - 240x3 - 240x4 - 320x1 - 320x2 - 320x3 - 640x1 - 640x2 Set display option above. Click on images to enlarge. © Richardson, 1905 · 1 Trichoniscus pusillus, dorsal © Richardson, 1905 · 1 Trichoniscus pusillus, fifth, pleopod © Richardson, 1905 · 1 Trichoniscus pusillus, first, antenna © Richardson, 1905 · 1 Trichoniscus pusillus, first, antenna, tip © Richardson, 1905 · 1 Trichoniscus pusillus, first, leg © Richardson, 1905 · 1 Trichoniscus pusillus, first, maxilla © Richardson, 1905 · 1 Trichoniscus pusillus, first, pleopod © Richardson, 1905 · 1 Trichoniscus pusillus, flagella © Richardson, 1905 · 1 Trichoniscus pusillus, head, lateral © Richardson, 1905 · 1 Trichoniscus pusillus, lips © Richardson, 1905 · 1 Trichoniscus pusillus, mandibles © Richardson, 1905 · 1 Trichoniscus pusillus, maxilliped © Richardson, 1905 · 1 Trichoniscus pusillus, outline, terminal, segment © Richardson, 1905 · 1 Trichoniscus pusillus, second, antenna 21 thumbnails  •  slide show Identification Reprinted from Richardson, H. 1905. Isopods of North America. Bulletin No. 54 of the United States National Museum. Localities. —North America; also Sweden, Denmark, Germany, France, Great Britain, Spain, Algeria, and Norway. Body oblong-ovate, three times as long as wide, 1 mm.: 3 mm. Head wider than long, with the anterior margin produced in a widely rounded, obtuse median lobe. There are no antero-lateral lobes. The eyes are small, round, composite, and situated in the antero-lateral angles of the head. The first pair of antennae are rudimentary and inconspicuous. The first three articles of the second antenna are short, the first two being subequal, the third, one and a half times longer than either of the others; the fourth and fifth are subequal and each is one and a half times longer than the third. The flagellum is composed of four or five ill-defined articles. The maxilliped has a palp of two articles. The palp of the mandibles is wanting. The segments of the thorax are subequal. The epimera are not separated off on any of the segments. The abdomen is abruptly narrower than the thorax. The first two segments have the lateral parts covered by the seventh thoracic segment. The sixth, or terminal, segment is wide posteriorly, with the post-lateral angles rounded and a slight emargination in the middle of the posterior margin. The basal article of the uropoda or the peduncle extends as far as the posterior margin of the terminal segment. The inner branch is more slender and is a little shorter than the outer branch. Both branches extend some distance beyond the abdomen. All the legs are ambulatory. Supported by National Biological Information Infrastructure National Science Foundation go to Discover Life's Facebook group Updated: 2024-05-02 07:42:33 gmt Discover Life | Top © Designed by The Polistes Corporation